rpc: error out from get_info if the proxied call errors out

Coverity 205410

src/rpc/core_rpc_server.cpp

@@ -2226,8 +2226,7 @@ namespace cryptonote
   //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_get_info_json(const COMMAND_RPC_GET_INFO::request& req, COMMAND_RPC_GET_INFO::response& res, epee::json_rpc::error& error_resp, const connection_context *ctx)
   {
-    on_get_info(req, res, ctx);
-    if (res.status != CORE_RPC_STATUS_OK)
+    if (!on_get_info(req, res, ctx) || res.status != CORE_RPC_STATUS_OK)
     {
       error_resp.code = CORE_RPC_ERROR_CODE_INTERNAL_ERROR;
       error_resp.message = res.status;